Machine for casting thin-walled large-size pieces

ABSTRACT

A machine for casting thin-walled large-size castings, such as panel-type parts, incorporating two leaves, one of which is fixed on a bed-plate and the other one on a movable shaft having a reversible drive, and secured on the same bed-plate. The shaft exterior is formed with a recess extending along the shaft length and further through the spacing between the leaves, the depth of the recess is adequate to accommodate the metal crust formed on the shaft surface from the moment the pouring process is started until the shaping of a piece being cast is completed; the machine leaves are provided with means for detaching and releasing the cast pieces from the half moulds.

[ 51 Oct. 10, 1972 MACHINE FOR CASTING TI-IIN- [52] us. c|....................................249/131, 164/404 WALLED LAR PIECES [51] Int. Cl. 7/10 581 Field ofSearch..........249/l37, 139, 162, 66, 95,

United States Patent Stebakov et al.

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Claims, 1 Drawing Figure Examiner-J. Spencer Overholser Assistant Examiner-John S. Brown Attorney-Holman & Stern Libkaskhte .6. Primary kv. l 1, Moldavskaya SSR, Tiraspol; Boris Alexandrovich Vshivkov, ulitsa kv. 9 Primorsky Krai, Arseniev; Sevantyan Ivanovich Podgorny, ulitsa Sovetskaya, 9,

such as panel-type parts, incorporating two leaves, one P929999 Z): of which is fixed on a bed-plate and the other one on a movable shaft having a reversible drive, and secured H H n lyllfi fli on the same bed-plate. The shaft exterior is formed Nikolaevich Milov, ulitsa Krivorozhwith a recess extending along the shaft length and 2, kv. 67, further through the spacing between the leaves, the Viktorovich depth of the recess is adequate to accommodate the metal crust formed on the shaft surface from the moment the pouring process is started until the shaping of a piece being cast is completed; the machine leaves are provided with means for detaching and releasing the cast pieces from the half moulds.

Skhodnya; Vladimir Alexandrovich Antonov, ulitsa K Gorkogo, 16,

Primorsky Krai, Arseniev both of Moscomvyacheslav V kov, ulitsa Lomonosova, 24, kv. 65, Primorsky Krai,

skaya, 27, korpus Moscow; Nikolai Navrotsky, ulitsa Junost, 17, kv. 1 l3, Tiraspol; Leonid Alexandrovich Nikolsky, Dokhturovsky pereulok, 20, kv. 13, Moscow, all of USSR.

May 10, 1971 [21] Appl. No.2 l 4l ,824

[22] Filed:

MACHINE FOR CASTING TI-IIN-WALLED LARGE- SIZE PIECES BACKGROUND OF THE INVENTION The present invention relates to machines for casting thin-walled large-size pieces, for instance, panel-type parts.

DESCRIPTION OF PRIOR ART Known in the art is a casting machine for producing thin-walled large-size pieces, fitted with two leaves having half moulds, one of which is fixed on a shaft with a reversible drive, and the other half mould being mounted on a bed-plate.

In the course of operation of such a machine liquid metal for casting is introduced into the cavity formed by two half moulds set-up in the casting machine leaves with the side walls and shaft surface representing the bottom of the casting space (mould cavity). Then the drive is switched on to turn the shaft together with the leaf rigidly secured on it, so as to bring the leaves together.

As the leaves are gradually brought together, the metal, enclosed between the half moulds, rises filling up the mould cavity and when a close contact is achieved it takes the shape of the piece to be cast. The metal poured into the lower part of the mould cavity is liable to produce a crust on the shaft exterior which prevents the stationary leaf from sliding over the surface of the shaft rotating beneath. The crust wedges up the shaft on its way where it should pass under the lower part of the stationary leaf. The ensuing distortion and more rapid wear on the shaft may lead to leakage of the liquid metal through the clearances produced. In addition, the removal of a cast piece from the casting machine also presents a problem as it is not equipped with the means facilitating the withdrawal of ready castings. Under the unified effect of the temperature and weight of the metal caused in the casting space of the machine, the shaft is liable to deflect.

DESCRIPTION OF THE INVENTION It is an object of the present invention to eliminate the above drawbacks.

The present invention provides a machine of the aforesaid type for casting thin-walled large-size pieces with an improved and novel shaft exterior which would ensure better closing of the leaves thereby resulting in improved serviceability and efficiency as well as prolonged service life.

The invention consists in a machine for casting thinwalled large-size pieces, having two half moulds and fitted with two leaves for its half moulds, one of which is fixed on a shaft with a reversible drive, and the other one on a bed-plate; conforming to this invention, there is provided a recess on the surface of the said shaft, extending all along the length of the shaft and the spacing between the leaves, being adequate in depth to accommodate the metal crust formed on the shaft exterior from the moment pouring of the metal is started till the casting is formed. Also, the leaves of the machine are equipped with a means for detaching the pieces from the half moulds.

The inventive features provided in the above machine offer the advantages of longer service life and ease of service.

The means for releasing ready castings may be made in the form of hollow cylinders fixed on the leaves and connected with a source of compressed air or hydraulic fluid with piston rods being coupled to a plate resting against a set of pushers free to pass through corresponding ports provided in the half moulds.

With such a construction detaching the cast piece from the half moulds is simple and is made possible by a smooth operation of the pushers.

BRIEF DESCRIPTION OF THE DRAWING To make the present invention more clear below is given the description of an exemplary embodiment of the casting machine of the invention, to be considered with due reference to the accompanying drawing which represents a lateral section (on a vertical plane) of the machine designed in conformity with the invention.

DESCRIPTION OF PREFERRED EMBODIMENT The machine for casting thin-walled large-size pieces comprises bed-pate 1 carrying a first leaf 2 and a movable shaft 3 with a second leaf 4 fixed thereon. The movement of shaft 3 can be reversed by means of a drive (not shown) fitted with bar 5 acting on leaf 4 as on a lever. In this instance shaft 3 functions as an axle. To prevent shaft 3 from sagging under the combined effect of the temperature and weight of the liquid metal introduced into the machine casting space, several supports are provided, some of the supports being in the intermediate section of shaft 3.

Arranged in said leaves are two half moulds 6 and 7. Side walls 8 on the face sides of leaves 2 and 4 are intended to keep the liquid metal from flowing out, when pouring with open leaves. As a result a casting space is formed with all four sides being closed and with shaft 3 acting as a support at the bottom.

Provided on the exterior of shaft 3 in the zone of slippage of leaf 2, fast on bed-plate 1, is longitudinal recess 9 stretching along shaft 3 and further along the spacing between leaves 2 and 4. The depth of the recess shall be adequate to accommodate the metal crust formed on the surface of shaft 3 from the moment the pouring process has been started and until a cast piece has been formed.

Leaves 2 and 4 are fitted with means 10 for detaching the ready piece from half moulds 6 and 7.

The means may have the shape of hollow cylinders 10 communicating with a source of compressed air or hydraulic fluid (not shown in the drawing). Rods ll of pistons 12 of hollow cylinders 10 act on plate 13 striking against pushers 14 passing easily through the ports in half moulds 6 and 7.

The casting machine functions as follows.

Secured on leaves 2 and 4 are half moulds 6 and 7 whose object is to form the piece to a requisite shape. The aforesaid half moulds and shaft 3 are heated with the aid of electric or gas heaters to a pre-set temperature, whereupon the surfaces of half moulds 6 and 7, shaft 3 and side walls 8 which form the mould cavity, are given a heat-insulating coating. Next a portion of the liquid metal is introduced into the mould cavity.

Following this the drive with its bar 5 is switched on to turn shaft 3 along with the leaf 4 to make leaf 4 approach leaf 2 fast on bed-plate 1. The lower portion of leaf 2 conforms tightly to the cylindrical surface of shaft 3 when leaves 2 and 4 of the casting machine are open. As shaft 3 revolves in the direction of leaf 2 fixed on bediplate l the leaf is transferred in a position above longitudinal recess 9 on shaft 3 containing the crust of the solidified metal which thereby does not hinder further convergence and closure of leaves 2 and 4.

The liquid metal above the recess is squeezed upwards filling the mould cavity and subsequently shaping the piece.

Upon holding leaves 2 and 4 closed for a requisite length of time a reversing drive with bar 5 is cut in after which shaft 3 is turned in the opposite direction and leaf 4 is separated from leaf 2.

Simultaneously the drive (not shown in the drawing) of the means for detaching the piece (casting) from half moulds 6 and 7 is energized.

In this example compressed air (fluid) is fed from its source (not shown in the drawing) to the interior of cylinders 10. When pistons 12 with rods 11 coupled to plates 13 respectively are displaced, the latter thrust against pushers 14, free to pass through the ports in half moulds 6 and 7 and to detach from them the cast piece from both sides at one and the same time.

The released cast piece is withdrawn from the machine which is then prepared for introduction (pouring) of the next portion of the molten metal.

As tests have displayed, the described machine enables the production of pieces of enhanced quality. The casting machine of the invention proved to have a higher production rate combining dependability and reliability in service with ease of maintenance.

We claim:

1. A machine for casting thin-walled large-size pieces comprising: a bed-plate; a shaft secured on the said bedplate and fitted with a reversible drive intended for its rotation; two leaf like parts for accommodating half moulds, one of which is fixed on said shaft while the other one is stationarily mounted on said bed-plate; a recess formed on the exterior of the said shaft along its length and located between the said leaf like parts, adequately deep to accommodate any metal crust formed on the surface of the said shaft from the moment pouring of liquid metal is started until a cast piece is formed; two complementary half moulds mounted one each in said leaf-like parts; means for releasing and detaching a cast piece from the said half moulds which means are attached on the said leaf-like parts and comprise pushers coupled with a an operating means.

2. A machine, of claim 1, in which said means for releasing the cast pieces are made in the form of hollow cylinders having piston rods and fastened on the said leaf-like parts and connected to be in communication with a source of compressed air or fluid with the piston rods of the cylinders being connected to a plate resting against the pushers which are free to pass through ports provided in the half moulds. 

1. A machine for casting thin-walled large-size pieces comprising: a bed-plate; a shaft secured on the said bed-plate and fitted with a reversible drive intended for its rotation; two leaf like parts for accommodating half moulds, one of which is fixed on said shaft while the other one is stationarily mounted on said bed-plate; a recess formed on the exterior of the said shaft along its length and located between the said leaf like parts, adequately deep to accommodate any metal crust formed on the surface of the said shaft from the moment pouring of liquid metal is started until a cast piece is formed; two complementary half moulds mounted one each in said leaf-like parts; means for releasing and detaching a cast piece from the said half moulds which means are attached on the said leaf-like parts and comprise pushers coupled with a an operating means.
 2. A machine, of claim 1, in which said means for releasing the cast pieces are made in the form of hollow cylinders having piston rods and fastened on the said leaf-like parts and connected to be in communication with a source of compressed air or fluid with the piston rods of the cylinders being connected to a plate resting against the pushers which are free to pass through ports provided in the half moulds. 